Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: questão: quais são todas as datas de retirada para o navio de carga ro-ro de parafuso duplo?
 ###Tabelas: CREATE TABLE apollo_astronauts_who_flew_to_the_moon_without_landing (apollo_astronauts_who_flew_to_the_moon_without_landing_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Born VARCHAR, Age on mission INT, Mission VARCHAR, Mission dates VARCHAR, Service VARCHAR) CREATE TABLE universities_and_colleges_ranked_by_endowment (universities_and_colleges_ranked_by_endowment_id AUTO_INCREMENT PRIMARY KEY, State Rank INT, National Rank INT, Institution VARCHAR, Location VARCHAR, Public or Private VARCHAR, Endowment Funds VARCHAR, Percentage Change YOY VARCHAR) CREATE TABLE y (y_id AUTO_INCREMENT PRIMARY KEY, Township VARCHAR, County VARCHAR, Pop. (2010) INT, Land ( sqmi ) INT, Water (sqmi) INT, Latitude INT, Longitude INT, GEO ID INT, ANSI code INT) CREATE TABLE ships_operated_by_zeeland_steamship_company_smz (ships_operated_by_zeeland_steamship_company_smz_id AUTO_INCREMENT PRIMARY KEY, Ships name VARCHAR, Date entered service VARCHAR, Date withdrawn VARCHAR, Tonnage INT, Type of Ship VARCHAR) CREATE TABLE season-by-season_performance (season-by-season_performance_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, Tier INT, Points INT, FA Cup VARCHAR, FA Trophy VARCHAR, Shropshire Senior Cup VARCHAR)  
SELECT Date withdrawn FROM ships_operated_by_zeeland_steamship_company_smz WHERE Type of Ship = Twin Screw Ro-Ro Motorship